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13. Fair Value Measurements (Details - Finance Receivables to Their Contractual Balances) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Finance receivables measured at fair value $ 821,066 $ 0 $ 0
Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Finance receivables measured at fair value 821,066 0  
Contractual Balance [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Finance receivables measured at fair value $ 829,039 $ 0